Notation

Symbol				Definition
${\mathcal {H}}\,\!$				Hilbert Space
${\mathbb {C} }\,\!$				The set of complex numbers
${\mathbb {R} }\,\!$				The set of real numbers
		Chapter 2 - Qubits and Collections of Qubits
$X\,\!$				The Pauli X matrix (see Table 2.1)
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${\delta _{ij}}\,\!$				The Kronecker delta (see Equation C.17)
${\epsilon _{ijk}}\,\!$				Epsilon (see Equation C.8)
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		Chapter 3 - Physics of Quantum Information
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$\hbar \,\!$				H-bar (Planck's constant divided by $2\pi \,\!$)
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${\vec {n}}\,\!$				A unit vector (see Section C.5.1)
$\lambda _{\pm }$				Eigenvalues (see Section C.6)
$\langle {\mathcal {O}}\rangle$				The expectation value of an operator (see Section 3.6)
		Chapter 4 - Entanglement
$\lambda \,\!$				A possible hidden variable (see Section 4.3)
$L\,\!$				Local operation (see Section 4.4 and Eq. (4.11))